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  <title>Constructs a new queue implemented using a doubly linked list</title>
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  <div id="layout-content"><div id="splqueue.construct" class="refentry">
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  <h1 class="refname">SplQueue::__construct</h1>
  <p class="verinfo">(PHP 5 &gt;= 5.3.0, PHP 7)</p><p class="refpurpose"><span class="refname">SplQueue::__construct</span> &mdash; <span class="dc-title">Constructs a new queue implemented using a doubly linked list</span></p>

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 <div class="refsect1 description" id="refsect1-splqueue.construct-description">
  <h3 class="title">说明</h3>
  <div class="constructorsynopsis dc-description">
   <span class="modifier">public</span> <span class="methodname"><strong>SplQueue::__construct</strong></span>()</div>

  <p class="para rdfs-comment">
   This constructs a new empty queue.
   <blockquote class="note"><p><strong class="note">注意</strong>: 
    <p class="para">
     This method automatically sets the iterator mode to 
     SplDoublyLinkedList::IT_MODE_FIFO.
    </p>
   </p></blockquote>
  </p>
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 <div class="refsect1 parameters" id="refsect1-splqueue.construct-parameters">
  <h3 class="title">参数</h3>
  <p class="para">此函数没有参数。</p>
 </div>


 <div class="refsect1 examples" id="refsect1-splqueue.construct-examples">
  <h3 class="title">范例</h3>
  <p class="para">
   <div class="example" id="example-3543">
    <p><strong>示例 #1 <span class="function"><strong>SplQueue::__construct()</strong></span> example</strong></p>
    <div class="example-contents">
<div class="phpcode"><code><span style="color: #000000">
<span style="color: #0000BB">&lt;?php<br />$q&nbsp;</span><span style="color: #007700">=&nbsp;new&nbsp;</span><span style="color: #0000BB">SplQueue</span><span style="color: #007700">();<br /><br /></span><span style="color: #0000BB">$q</span><span style="color: #007700">[]&nbsp;=&nbsp;</span><span style="color: #0000BB">1</span><span style="color: #007700">;<br /></span><span style="color: #0000BB">$q</span><span style="color: #007700">[]&nbsp;=&nbsp;</span><span style="color: #0000BB">2</span><span style="color: #007700">;<br /></span><span style="color: #0000BB">$q</span><span style="color: #007700">[]&nbsp;=&nbsp;</span><span style="color: #0000BB">3</span><span style="color: #007700">;<br /><br />foreach&nbsp;(</span><span style="color: #0000BB">$q&nbsp;</span><span style="color: #007700">as&nbsp;</span><span style="color: #0000BB">$elem</span><span style="color: #007700">)&nbsp;&nbsp;{<br />&nbsp;echo&nbsp;</span><span style="color: #0000BB">$elem</span><span style="color: #007700">.</span><span style="color: #DD0000">"\n"</span><span style="color: #007700">;<br />}<br /></span><span style="color: #0000BB">?&gt;</span>
</span>
</code></div>
    </div>

    <div class="example-contents"><p>以上例程会输出：</p></div>
    <div class="example-contents screen">
<div class="cdata"><pre>
1
2
3
</pre></div>
    </div>
   </div>
   <div class="example" id="example-3544">
    <p><strong>示例 #2 Efficiently handling tasks with <span class="classname"><a href="class.splqueue.html" class="classname">SplQueue</a></span></strong></p>
    <div class="example-contents">
<div class="phpcode"><code><span style="color: #000000">
<span style="color: #0000BB">&lt;?php<br />$q&nbsp;</span><span style="color: #007700">=&nbsp;new&nbsp;</span><span style="color: #0000BB">SplQueue</span><span style="color: #007700">();<br /></span><span style="color: #0000BB">$q</span><span style="color: #007700">-&gt;</span><span style="color: #0000BB">setIteratorMode</span><span style="color: #007700">(</span><span style="color: #0000BB">SplQueue</span><span style="color: #007700">::</span><span style="color: #0000BB">IT_MODE_DELETE</span><span style="color: #007700">);<br /><br /></span><span style="color: #FF8000">//&nbsp;...&nbsp;enqueue&nbsp;some&nbsp;tasks&nbsp;on&nbsp;the&nbsp;queue&nbsp;...<br /><br />//&nbsp;process&nbsp;them<br /></span><span style="color: #007700">foreach&nbsp;(</span><span style="color: #0000BB">$q&nbsp;</span><span style="color: #007700">as&nbsp;</span><span style="color: #0000BB">$task</span><span style="color: #007700">)&nbsp;{<br />&nbsp;&nbsp;&nbsp;&nbsp;</span><span style="color: #FF8000">//&nbsp;...&nbsp;process&nbsp;$task&nbsp;...<br /><br />&nbsp;&nbsp;&nbsp;&nbsp;//&nbsp;add&nbsp;new&nbsp;tasks&nbsp;on&nbsp;the&nbsp;queue<br />&nbsp;&nbsp;&nbsp;&nbsp;</span><span style="color: #0000BB">$q</span><span style="color: #007700">[]&nbsp;=&nbsp;</span><span style="color: #0000BB">$newTask</span><span style="color: #007700">;<br />&nbsp;&nbsp;&nbsp;&nbsp;</span><span style="color: #FF8000">//&nbsp;...<br /></span><span style="color: #007700">}<br /></span><span style="color: #0000BB">?&gt;</span>
</span>
</code></div>
    </div>

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